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Then he attacks friction. Let's take a side bar: consider a cold widget
which is sliding on ice, the widget slows. therefore its level of energy
is decreased. The _only_ way to change the level of energy of a system is
to do work on the system. What then does this work? Obviously it is the
ice. But how? By exerting a frictional force. Hence, friction does
work. And again he does not understand the work/energy theorem.